Name 4 drugs with low hepatic extraction ratio

Diazepam. Methadone. Rocuronium. Thiopental.

What is the respiratory quotient?

Ratio of CO2 produced to O2 consumed during metabolism

What is the affect of Sch on lower esophageal sphincter tone in pregnancy?

It increased to tone and decreases risk of aspiration

27

What is the venous admixture equation? ("shunt equation")

Qs/Qt= CcO2-CaO2/Cc02-CvO2

28

Up until what post-conceptual age is it prudent to monitor a neonate overnight after general anesthesia?

60 weeks

29

Three requirements to prevent rebreathing in traditional circle circuit system?

1. A unidirectional valve must be positioned between the patient and both the inspiratory and expiratory limbs 2. Fresh gas flow cannot come into the circle system between the patient and the expiratory valve 3. The APL valve cannot be positioned between the patient and the inspiratory valve

30

What is the shortcut for calculating the volume of liquid volatile anesthetic consumed in one hour?

ml/hr=3*FGF(L/min)* % anesthetic vapor

31

What is the distance relationship between arterial line transducers and blood pressure?

10 cm change results in 7.5 mmHg change

32

What is Henry's Law?Dalton/s Law?

Henry: Concentration of gas dissolved in a solution is directly proportional to the partial pressure

Dalton: The total pressure of a gas is equal to the sum of the partial pressures of individual gasses.

33

What's the quick way to approximate the volume remaining in an O2 tank?

3:1 rule. So if full, 2000 psi then about 625 L

34

At what serum levels does hypermagnesemia cause respiratory depression?

At what levels will QRS become widened?

15-20 mg/dL

(cardiac): 5-10 mg/dL

35

What are the effect of PEEP on hemodynamics? In systolic HF?

Increases Intrathoracic pressure thereby increasing right ventricular afterload. This decreases preload which can lead to hypotension in normovolemic without heart failure.

In heart failure preload is excessive. So PEEP improves CO and decreases LVEDP.